doesn't a rationalist still have to believe that the chance of X being true is non-trivially greater than zero?

http://lesswrong.com/lw/jr/how_to_convince_me_that_2_2_3/

http://lesswrong.com/lw/qv/the_rhythm_of_disagreement/

Be less ready to disagree with a supermajority than a mere majority; be less ready to disagree outside than inside your expertise; always pay close attention to the object-level arguments; never let the debate become about tribal status.